EP1743467B1 - Refined quality feedback in streaming services - Google Patents

Refined quality feedback in streaming services Download PDF

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Publication number
EP1743467B1
EP1743467B1 EP05737952.1A EP05737952A EP1743467B1 EP 1743467 B1 EP1743467 B1 EP 1743467B1 EP 05737952 A EP05737952 A EP 05737952A EP 1743467 B1 EP1743467 B1 EP 1743467B1
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Prior art keywords
playback
quality
client
media stream
metric
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German (de)
French (fr)
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EP1743467A1 (en
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Ye-Kui Wang
Igor Curcio
Emre Aksu
Miska Hannuksela
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Nokia Technologies Oy
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Nokia Technologies Oy
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Priority to US10/841,228 priority Critical patent/US8010652B2/en
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Priority to PCT/IB2005/001296 priority patent/WO2005109821A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance or administration or management of packet switching networks
    • H04L41/50Network service management, i.e. ensuring proper service fulfillment according to an agreement or contract between two parties, e.g. between an IT-provider and a customer
    • H04L41/508Network service management, i.e. ensuring proper service fulfillment according to an agreement or contract between two parties, e.g. between an IT-provider and a customer based on type of value added network service under agreement
    • H04L41/509Network service management, i.e. ensuring proper service fulfillment according to an agreement or contract between two parties, e.g. between an IT-provider and a customer based on type of value added network service under agreement wherein the managed service relates to media content delivery, e.g. audio / video / TV
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance or administration or management of packet switching networks
    • H04L41/50Network service management, i.e. ensuring proper service fulfillment according to an agreement or contract between two parties, e.g. between an IT-provider and a customer
    • H04L41/5038Testing of service level quality, e.g. simulating service usage
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing packet switching networks
    • H04L43/06Report generation
    • H04L43/065Report generation for device related reporting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing packet switching networks
    • H04L43/08Monitoring based on specific metrics
    • H04L43/0852Delays
    • H04L43/087Jitter
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing packet switching networks
    • H04L43/10Arrangements for monitoring or testing packet switching networks using active monitoring, e.g. heartbeat protocols, polling, ping, trace-route
    • H04L43/106Arrangements for monitoring or testing packet switching networks using active monitoring, e.g. heartbeat protocols, polling, ping, trace-route by adding timestamps to packets
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements or protocols for real-time communications
    • H04L65/80QoS aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/23406Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving management of server-side video buffer
    • HELECTRICITY
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    • H04N21/24Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
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    • H04ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/44Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/44004Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
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    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/442Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • HELECTRICITY
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    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N21/61Network physical structure; Signal processing
    • H04N21/6106Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N21/63Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637Control signals issued by the client directed to the server or network components
    • H04N21/6377Control signals issued by the client directed to the server or network components directed to server
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    • H04N21/63Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643Communication protocols
    • HELECTRICITY
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    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643Communication protocols
    • H04N21/64322IP
    • HELECTRICITY
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    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/65Transmission of management data between client and server
    • H04N21/658Transmission by the client directed to the server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/65Transmission of management data between client and server
    • H04N21/658Transmission by the client directed to the server
    • H04N21/6581Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/65Transmission of management data between client and server
    • H04N21/658Transmission by the client directed to the server
    • H04N21/6582Data stored in the client, e.g. viewing habits, hardware capabilities, credit card number

Description

    Field of the invention
  • This invention relates to a method, a computer program, a computer program product, a system, a client, a server and a protocol for quality feedback in a streaming service, wherein at least one media stream is streamed to a client for playback.
  • Background of the invention
  • Streaming, on the one hand, refers to the ability of an application settled in a client to play back synchronized media streams like speech, audio and video streams in a continuous way while those streams are being transmitted to the client over a data network. On the other hand, streaming also refers to real-time low-delay applications such as conversational applications.
  • Applications that can be built on top of streaming services can be classified into on-demand and live information delivery applications. Examples of the first category are music and news-on-demand applications. Live delivery of radio and television programs are examples of the second category. Real-time low delay application are, for example, multimedia (video)telephony or Voice over IP and any type of conversational multimedia application.
  • Streaming over fixed Internet Protocol (IP) networks is already a major application today. While the Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C) have developed a set of protocols used in fixed-IP streaming services, no complete standardized streaming framework has yet been defined. For Third Generation (3G) mobile communications systems according to the standards developed by the Third Generation Partnership Project (3GPP), the 3G Packet-switched Streaming Service (PSS, 3GPP TS 26.233, TS 26.234) fills the gap between the 3G Multi-media Messaging Service (MMS), for instance downloading applications and multimedia content, and conversational & streaming services.
  • The PSS enables mobile streaming applications, wherein the complexity of the terminals is lower than that required for conversational services, because no media input devices and encoders are required, and because less complex protocols can be used. The PSS includes a basic set of streaming control protocols, transport protocols, media codecs and scene description protocols.
  • Fig. 1 schematically depicts the PSS protocol stack 1 that controls the transfer of both streamable and non-streamable content between a content or media server and a client.
  • Streamable content 101, such as video, audio and speech, is first converted to the payload format of the Real-time Transport Protocol (RTP) 102 in an adaptation layer 103. Said RTP as defined by the IETF provides means for sending real-time or streaming data by using the services of an underlying User Datagram Protocol (UDP) 104, which in turn uses the services of an underlying IP protocol 105.
  • Non-streamable content 106, as for instance multimedia content which is not created for streaming purposes (e.g. MMS clips recorded on a terminal device), still images, bitmap and vector graphics, text, timed text and synthetic audio are transferred by the Hypertext Transfer Protocol (HTTP) 107, which uses the services of the underlying Transport Control Protocol (TCP) 108 and the further underlying IP 105.
  • Whereas for the non-streamable content 106, the built-in session set-up and control capabilities of the HTTP 107 are sufficient to transfer the content, in case of streamable content 101, an advanced session set-up and control protocol has to be invoked, for instance to start, stop and pause a streaming video that is transferred from the content server to the client via the RTP/UDP/IP. This task is performed by the Real-time Streaming Protocol (RTSP) 109, which may either use the underlying TCP 108 or the underlying UDP 104. RTSP requires a presentation description 110 at least to set-up a streaming session. Such a presentation description 110 may for instance be available in the form of a Session Description Protocol (SDP) file. Said SDP file contains the description of the session, for instance session name and author, the type of media to be presented, information to receive said media, as for instance addresses, ports, formats and so on, and the bitrate of the media.
  • If streaming content is to be viewed at the client side, for instance at a mobile terminal, the user of said terminal is first provided with a Universal Resource Identifier (URI) to specific content that suits his terminal. This URI may come form a WWW server, a Wireless Application Protocol (WAP) server, or may have been entered manually via the keyboard of the terminal. This URI specifies a streaming or RTSP server and the address of the content on that or another content server. The corresponding SDP file may now be obtained in a number of ways. It may be provided in a link inside the HTML page that the user downloads, for instance via an embed tag, or may also be directly obtained by typing it as a URI. The SDP file, i.e. the presentation description 110, then is transferred via the HTTP 107 as indicated in the middle column of the protocol stack of Fig. 1. Alternatively, it may also be obtained through RTSP 109 signaling, for instance by using the DESCRIBE method of the RTSP 109, as indicated by the right column of the protocol stack in Fig. 1. Note that the presentation description may equally well be transmitted by said RTP 102. However, for simplicity of presentation, this possibility was not included in Fig. 1.
  • The subsequent session establishment is the process in which the browser or the user of the mobile terminal invokes a streaming client to set up the session against the content server. The terminal is expected to have an active radio bearer that enables IP-based packet transmission at the start of session establishment signaling.
  • The subsequent set-up of the streaming service is done by sending an RTSP SETUP message for each media stream chosen by the client. This returns the UDP 104 and/or TCP 108 port to be used for the respective media stream. The client sends an RTSP PLAY message to the content server that then starts to send one or more streams over the IP network.
  • In order to offer service providers in PSS systems means to evaluate the end user streaming experience, streaming service quality metrics have been introduced in PSS systems, as presented in 3GPP Technical document (Tdoc) S4-040073: "Draft Rel-6 PSS Quality Metrics Permanent Document v.0.11", which refers to 3GPP TSG-SA4 meeting #30 in Malaga, Spain, February 23-27, 2004. The streaming client measures and feeds back information on the quality of the actual streaming application (Quality of Experience, QoE) to a streaming server, wherein said quality is defined in terms of said quality metrics. Said streaming server may for instance be an RTSP server, and said quality metrics may for instance be transported by using said RTSP and SDP.
  • Because the service is transparent to the type of RAN and CN, only the streaming client and the streaming server are impacted by the PSS quality metrics. One consequence of this is that the measurements may not rely on information from protocol layers below the RTP layer (e.g. UDP, IP, PDCP, SNDCP, LLC, RLC, MAC, Physical Layer).
  • The terminal in a PSS system with quality feedback is responsible to perform the quality measurements in accordance to the measurement definition, aggregate them into streaming client quality metrics and report the metrics to the streaming server. This requirement does not preclude the possibility for the streaming client to report raw quality measurements to be processed by the streaming server into quality metrics.
  • The streaming server is responsible to signal the activation of the streaming client's quality metrics reporting and to gather the streaming client's quality metrics. The streaming server may process the received streaming client's quality metrics to build aggregated quality metrics. E.g. it could receive a raw lost packets report and build the Min, Max, Avg and Std packet loss rate for a particular streaming client.
  • The following four quality metrics are defined by Tdoc S4-040073:
  • Corruption duration
  • Corruption duration is the time period from the first corrupted frame to the first subsequent good frame or the end of the reporting period (whichever is sooner). The unit of this metrics is expressed in seconds, and can be a fractional value.
  • Rebuffering duration
  • This metric is only applicable for audio, video and speech, and is not applicable to other media types. The unit of this metrics is expressed in seconds, and can be a fractional value. Rebuffering is defined as any stall in playback time due to any involuntary event at the client side.
  • Initial buffering time
  • Initial buffering is the time from receiving the first RTP packet until playback starts. The unit of this metrics is expressed in seconds, and can be a fractional value.
  • Number of content packets lost in succession
  • The number of content packets lost in succession per media channel.
  • The objective of the above quality metric definition is to obtain consistent measurements across content type, terminals, and types of Radio Access Network (RAN).
  • The constraints are to minimize the size of the quality metrics report that will be sent to the streaming server and, the complexity for the terminal.
  • The actual quality metrics feedback can be conveyed to the PSS server by using the SET_PARAMETER method of the RTSP with a feedback header 2 as depicted in Fig. 2 (with reference to IETF Request for Comments (RFC) document 2327), however, in particular cases, it is more efficient to use other methods to carry the information, as for instance the TEARDOWN message or the PAUSE message.
  • In the feedback header 2 of Fig. 2, Stream-url is the RTSP session or media control URL identifier for the feedback parameter. The Metrics field in the Parameters definition contains the name of the metrics/measurements (for instance corruption duration, etc.). The Value field indicates the results. There is the possibility that the same event occurs more than once during a monitoring period. In that case the metrics value can occur more than once, which indicates the number of events to the server. The optional Range field indicates the reporting period.
  • The optional Timestamp field in the feedback header 2 of Fig. 2 indicates the time when the event (or measurement) occurred or when the metric was calculated since the beginning of the session.
  • The four quality metrics defined by Tdoc S4-040073 only allow for a coarse characterization of the quality of the playback of multimedia streams as experienced by a user. For instance, if two streaming sessions have the same values of the four quality metrics defined by Tdoc S4-040073, and if in the first of said sessions, a perfect synchronization between audio and video data exists, whereas in the second of said sessions, said synchronization between audio and video has been lost, the reported quality based on the four quality metrics defined by Tdoc S4-040073 is the same while the actually experienced quality of playback is quite different. Furthermore, the four quality metrics defined by Tdoc S4-040073 do not differentiate between the different frame types contained in said multimedia stream, so that, for instance, the loss of frame types that are of crucial importance for the experienced quality of the playback can not be differentiated from the loss of less important types of frames when reporting quality.
  • Document US 2003/046384 A1 discloses a method of providing streaming service quality metrics from a client to a server. Different quality metrics can be used such as peak bandwidth, low bandwidth, high/low latency, jitter, client video-rendering frame rate.
  • Document XP009028505 discloses a method for efficient frame scheduling for mpeg video streams. The method is evaluated by using standard deviation of frame rate which is related to a mean value of frame rates over multiple streams.
  • Document XP002374403 discloses using effective frame rate as a metric used for video streaming.
  • Summary of the invention
  • The present invention defines a method according to claim 1, a computer program according to claim 13, a computer program product according to claim 14, a system according to claim 15, a client according to claim 16 and a server according to claim 28. Further embodiments are set forth in the dependent claims 2-12, 17-27, 29 and 30.
  • Brief description of the figures
  • In the figures show:
  • Fig. 1:
    A schematic representation of a Packet-Switched Streaming Service (PSS) protocol stack according to the prior art,
    Fig. 2:
    a definition of a Real-time Streaming Protocol (RTSP) negotiation header according to the prior art,
    Fig. 3:
    a flowchart of the method of the present invention, and
    Fig. 4:
    a schematic representation of a system according to the present invention.
    Detailed description of the invention
  • The present invention proposes special quality metrics to be used in quality feedback for streaming services in order to refine quality feedback. In the following, the proposed quality metrics and their associated timestamps will be described in more detail.
  • Frame-rate-deviation
  • This quality metric may only be applicable for audio, video and speech, and it may not be applicable to other media types. It gives information on the playback frame rate. Frame rate deviation happens when the playback frame rate deviates from a pre-defined value. This quality metric may contain both the time duration of the event and the frame rate deviation value, i.e. the difference between a pre-defined frame rate and the actual playback frame rate. The time duration may be expressed in units of seconds, and may be a fractional value. The deviation value may be expressed in units of frames per second, and may also be a fractional value.
  • Said pre-defined value may be a default value known by both the server and the client, or it may be provided by the server during QoE negotiation. If it is to be provided by the server, the server may decide the value by checking the media bitstream or any other means.
  • It may be advantageous that the value indicates the average frame rate calculated when the media stream is locally played back.
  • From an implementation point of view, the following method may be specified to calculate the frame rate. It is assumed that the frame rate changes only at integer seconds. The frame rate value of the time period from second n-1 to second n is equal to the number of frames played back during the period. The time axis may represent NPT time and may originate from the starting time of the QoE reporting period.
  • The timestamp associated with the frame-rate-deviation metric indicates the time when the frame rate deviation has occurred. The value of the timestamp may be equal to the NPT of the first played frame during the frame rate deviation event, relative to the starting time of the QoE reporting period. If there is no played frame during the event, the value may be equal to the NPT of the last played frame before the event or the starting time of the QoE reporting period, whichever is later, relative to the starting time of the QoE reporting period.
  • Jitter-duration
  • This quality metric may be only applicable for audio, video and speech, and may not be applicable to other media types. A playback jitter happens when the absolute difference between the actual playback time and the scheduled playback time is larger than a pre-defined value. This metric may be expressed in units of seconds, and may be a fractional value. Said pre-defined value may be a default value known by both the server and the client, e.g. 100 milliseconds.
  • The timestamp associated with the jitter-duration metric indicates the time when the playback jitter has occurred. The value of the timestamp may be equal to the NPT of the first played frame in the playback jitter, relative to the starting time of the QoE reporting period.
  • Synchronization-loss-duration
  • This quality metric may be applicable for any pair of media types. Define a value A as a difference between a playback time of a last played frame of a first media stream of said at least one media streams and a playback time of a last played frame of a second media stream of said at least one media streams, and define a value B as a difference between a scheduled playback time of said last played frame of said first media stream of said at least one media streams and a scheduled playback time of said last played frame of said second media stream of said at least one media stream.
  • A synchronization loss happens when the absolute difference between said value A and said value B is larger than a pre-defined value. This quality metric may be expressed in units of seconds, and may be a fractional value. Said pre-defined value may be a default value known by both the server and the client, e.g. 100 milliseconds.
  • The timestamp associated with the synchronization-loss-duration metric indicates the time when the playback synchronization loss has occurred. The value of the timestamp may be equal to the NPT of the first played frame in the synchronization loss, relative to the starting time of the QoE reporting period.
  • Number-of-corrupted-scene-cut-frames
  • This quality metric may be only applicable for video, and may not be applicable to other media types. This metric refers to the number of corrupted scene cut frames during the QoE reporting period. This metric may be expressed in units of integers larger than or equal to zero. If this metric is supported, and if no such metric is reported for a QoE reporting period, this may indicate that no scene cut frame has been corrupted during the QoE reporting period.
  • This quality metric may be used if the server has information indicating which frames are scene cut frames, or if the server implements a method to derive the information, for instance by using a scene cut detection algorithm. In this case, it may be advantageous that the server makes the information available to the client either via in-band or out-of-band signaling. This quality metric may also be used if the client implements a method to derive the information, for instance by using a scene cut detection algorithm. For example, in ITU-T H.264 (a.k.a. ISO/IEC MPEG-4 Part 10), scene cut information can be conveyed to the client in-band using the scene information supplemental enhancement information (SEI) message.
  • The timestamp associated with the number-of-corrupted-scene-cut-frames metric may not be defined, since it may be clear that the time when the number of corrupted scene cut frames is measured is equal to the ending time of the QoE reporting period.
  • An example protocol syntax for each of the new quality metrics as proposed by the present invention for instance reads as:
 Framerate_Deviation = "Framerate_Deviation" "=" "{" SP / (Valuel SP
 Value2 [SP Timestamp])#("," Value1 SP Value2 [SP Timestamp])"}";
 Jitter_Duration = "Jitter_Duration" "=" "{" SP / (Value [SP
 Timestamp])#("," Value [SP Timestamp]) "}";
 Syncloss_Duration = "Syncloss_Duration" "=" "{" SP / (Value [SP
 Timestamp])#("," Value [SP Timestamp]) "}";
 Corrupted_Scene_Cuts = "Corrupted_Scene_Cuts" "=" "{" SP / Value "}";
  • Therein, the Value1 field indicates the time duration of the frame rate deviation event, and the Value2 field indicates the frame rate deviation value. The Value field indicates the time duration of the playback jitter, the time duration of synchronization loss, or the number of corrupted scene cut frames. The semantics of the Timestamp field are as specified above.
  • In quality feedback, there exists the possibility that the same event occurs more than once during a monitoring period. In that case, a quality feedback value may occur more than once, which indicates the number of events to the server.
  • To enable the client to calculate the frame-rate-deviation metric, a pre-defined frame rate value may need to be sent to the client. In this case, the value can be added as one additional parameter to an RSTP header QoE-Header or SDP attribute "QoE-Metrics", as specified in Tdoc S4-040073. The syntax design for the pre-defined frame rate value may, for example, be defined as follows:
  •  Pre-defined Frame Rate = "FR" "=" 1*DIGIT "." 1*DIGIT
  • The syntaxes of the RTSP QoE-Header and the SDP QoE-Metrics then may become:
  •  QoE-Header = "QoE-Metrics" ":" "Off" / 1# (stream-url ";" Metrics ";"
     Sending-rate [";" Range] [";" FR]) CRLF
     and
     a=QoE-Metrics: Metrics ";" Sending-rate [";" Range] [";" FR] CRLF
  • To use transmission bandwidth more efficiently when performing quality feedback in streaming services, the present invention proposes that a quality feedback value determined according to the corruption-duration metric is only reported if said duration is larger than a pre-defined value. During playback, if only a single frame or a few frames in a short time period are not played back, the end user typically cannot perceive the difference. The receiving terminal may decide not to play back a frame for instance due to one of the following reasons: Due to any reason, a non-reference frame has not been transmitted from the server; a non-reference frame is partially or entirely lost; a non-reference frame is completely received, but cannot be correctly decoded; a non-reference frame is completely received, but due to delay or lacking of computing capability, it is not decoded; a reference or non-reference frame is completely received and correctly decoded but its scheduled display time has expired. Non-playback of such frames in a short time period does not affect user experience, so that reporting of such frames of a short time period would be a waste of transmission bandwidth. Thus, according to the present invention, it is proposed that a corruption duration is only reported when it exceeds said pre-defined value, which may for instance be a default value set by the server and/or the client or a value prescribed by a protocol.
  • Fig. 3 depicts a flowchart of a method according to the present invention. In a first step 300, a streaming session is set up between a streaming client and a streaming server. In a step 301, one or more quality metrics from a pre-defined set of quality metrics, which comprises the quality metrics as proposed by the present invention, are negotiated between the streaming client and the streaming server for use in the quality feedback procedure that is performed by the streaming client. Both said session set-up and negotiation may be based on an RTSP in combination with an SDP, or on an RTCP or SIP. Step 301 may also be performed together with step 300. A corresponding timestamp metric may be associated with at least some of the negotiated quality metrics for the streaming session. In a step 302, the actual streaming is started, for instance when a media stream is transmitted to the streaming client and played back on the terminal in which said streaming client is set up. During said streaming, in a step 303, it is checked if a quality feedback is required or not. This may for instance be accomplished by continuously checking if an event, which has to be reported to the streaming server according to the negotiated quality metric, occurs or not. This may for instance be a loss of synchronization event. Alternatively, a periodical quality report may have been negotiated, for instance the periodical feed-back of the number of corrupted scene cut frames in a certain time interval. In said step 303, both the event-driven and the periodical quality feed-back is triggered. If it is decided that quality feedback is required, in a step 304, a quality feedback value is determined according to each negotiated quality metric. If one or several of said negotiated quality metrics are associated with a timestamp metric, corresponding timestamps are determined in a step 305. Said step 305 may equally well be performed before the step 304. The quality feedback values and the corresponding timestamps are then reported to the streaming server in a step 306, for instance via the RTSP, RTCP or SIP. After quality feedback, or if it is decided that no quality feedback is required, it is checked in a step 307 if streaming is to be stopped. If this is not the case, it is again checked in a step 303 if a new quality feedback is required or not.
  • Fig. 4 schematically depicts the functional components of a system according to the present invention. This embodiment exemplarily refers to a PSS system that uses an RTSP to control the streaming. It is understood that equally well, the SIP could be used here with a slightly modified underlying protocol stack and with an additional network instance that sniffs or captures the quality feedbacks and timestamps that are sent from the client 601 (a first party) to the server 600 (a second party). The PSS system in Fig. 4 comprises a streaming client 601 and a streaming server 600, wherein both client 601 and server 600 have at least one RTSP entity 401, 400 that is capable of operating the RTSP. The RTSP entities 400, 401 use the services of underlying protocol layers that are operated by further protocol entities, of which only the TCP/UDP entities 402, 403 and the IP entities 404, 405 are shown. The streaming client 601 is further connected to a streaming quality monitor instance 407, which monitors the quality of the actual streaming application in terms of the negotiated quality metrics and possibly a corresponding timestamp metric and inputs monitored quality feedback values into said RTSP entity 401. Said streaming quality monitor may for instance be provided by the terminal, in which said streaming client is set up. If a timestamp metric is defined for the used quality metric, the streaming quality monitor 407 then determines a timestamp according to said timestamp metric, and transfers said monitored quality feedback values and said corresponding timestamps, via the client RTSP 401, to the RTSP peer entity in the streaming server 600, where they are input into a quality data processing instance 406 for evaluation and analysis, which may for instance aim at improving the quality of the streaming application by enhancing the error resilience of the streams if it is found that the corruption duration events become too frequent, or just aim at statistical quality data collection or charging or other aims.
  • The invention has been described above by means of a preferred embodiment. It should be noted that there are alternative ways and variations which are obvious to a skilled person in the art and can be implemented without deviating from the scope of the appended claims. In particular, the present invention is by no means restricted to application in 3G radio communications systems. It may equally well be deployed in all kinds of wired and wireless data transmission systems with parameter feedback.
  • Claims (30)

    1. A method comprising:
      - determining (304) a quality feedback value according to at least one quality metric from a pre-defined set of quality metrics, the at least one quality metric being at least a quality metric related to a playback of a media stream streamed to a client (601) in a streaming service; and
      - reporting (306) said quality feedback value to a server (600),
      characterized in that
      said quality metric related to said playback of said media stream is a frame-rate-deviation metric that is related to a deviation of a playback frame rate of said playback of said media stream from a pre-defined value provided by said server.
    2. The method according to claim 1, wherein said quality metric contains a frame rate deviation value indicating a difference between a pre-defined frame rate and the actual playback frame rate of said playback of said media stream.
    3. The method according to claim 1, wherein said frame-rate-deviation metric further is related to a duration of said deviation.
    4. The method according to claim 1, wherein said quality metric is reported together with a timestamp.
    5. The method according to claim 1, wherein said frame-rate-deviation metric is reported together with a timestamp, and wherein said timestamp is equal to a play time of a first played frame during said deviation relative to a starting time of a quality reporting period.
    6. The method according to claim 5, wherein said play time is a Normal Play Time NPT.
    7. The method according to claim 1, wherein said pre-defined set of quality metrics contains a further quality metric related to said playback of said media stream, wherein said further quality metric is jitter-duration metric that is related to a duration of a jitter event that occurs when a difference between a playback time of said media stream and a scheduled playback time is larger than a pre-defined value.
    8. The method according to claim 1, wherein said streaming of said media stream is based on a Real-time Transport Protocol RTP (102).
    9. The method according to claim 1, wherein said streaming is at least partially controlled by a Real-time Streaming Protocol RTSP (109).
    10. The method according to claim 9, wherein said quality feedback value is reported to said server (600) via said RTSP (109).
    11. The method according claim 1, wherein said streaming service is a Packet-switched Streaming Service PSS in a 3G mobile communications system.
    12. The method according claim 1, wherein said pre-defined value is provided by said server during QoE negotiation.
    13. A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method steps of claim 1.
    14. A computer program product comprising a computer program according to claim 13.
    15. A system, comprising:
      - at least one server (600), and
      - at least one client (601),
      wherein a media stream is streamed to said at least one client (601) for playback, wherein a quality feedback value is determined according to at least one quality metric from a pre-defined set of quality metrics, the at least one quality metric being at least a quality metric related to said playback of said media stream, and wherein said quality feedback value is reported to said at least one server (600),
      characterized in that
      said quality metric related to said playback of said media stream is a frame-rate-deviation metric that is related to a deviation of a playback frame rate of said playback of said media stream from a pre-defined value provided by said server.
    16. A client (601), comprising:
      - means for receiving a media stream that is streamed to said client (601) for playback in a streaming service,
      - means for determining a quality feedback value according to at least one quality metric from a pre-defined set of quality metrics, the at least one quality metric being at least a quality metric related to said playback of said media stream; and
      - means for reporting said quality feedback value to a server (600),
      characterized in that
      said quality metric related to said playback of said media stream is a frame-rate-deviation metric that is related to a deviation of a playback frame rate of said playback of said media stream from a pre-defined value provided by said server (600).
    17. The client (601) according to claim 16, wherein said quality metric contains a frame rate deviation value indicating a difference between a pre-defined frame rate and the actual playback frame rate of said playback of said media stream.
    18. The client (601) according to claim 16, wherein said frame-rate-deviation metric further is related to a duration of said deviation.
    19. The client (601) according to claim 16, wherein said quality metric is reported together with a timestamp.
    20. The client (601) according to claim 16, wherein said frame-rate-deviation metric is reported together with a timestamp, and wherein said timestamp is equal to a play time of a first played frame during said deviation relative to a starting time of a quality reporting period.
    21. The client (601) according to claim 20, wherein said play time is a Normal Play Time NPT.
    22. The client (601) according to claim 16, wherein said pre-defined set of quality metrics contains a further quality metric related to said playback of said media stream, wherein said further quality metric is jitter-duration metric that is related to a duration of a jitter event that occurs when a difference between a playback time of said media stream and a scheduled playback time is larger than a pre-defined value.
    23. The client (601) according to claim 16, wherein said streaming of said media stream is based on a Real-time Transport Protocol RTP (102).
    24. The client (601) according to claim 16, wherein said streaming is at least partially controlled by a Real-time Streaming Protocol RTSP (109).
    25. The client (601) according to claim 24, wherein said quality feedback value is reported to said server via said RTSP (109).
    26. The client (601) according claim 16, wherein said streaming service is a Packet-switched Streaming Service PSS in a 3G mobile communications system.
    27. The client (601) according claim 16, wherein said pre-defined value is provided by said server (600) during QoE negotiation.
    28. A server (600) comprising:
      - means for receiving a quality feedback value that is reported by a client (601) to said server (600), wherein said quality feedback value is determined by said client (601) according to at least one quality metric from a pre-defined set of quality metrics, the at least one quality metric being at least a quality metric related to a playback of a media stream that is streamed to said client (601), characterized in that
      said quality metric related to said playback of said media stream is a frame-rate-deviation metric that is related to a deviation of a playback frame rate of said playback of said media stream from a pre-defined value, and in that
      said server further comprises means for providing said pre-defined value to said client.
    29. The server (600) according to claim 28, wherein said quality metric contains a frame rate deviation value indicating a difference between a pre-defined frame rate and the actual playback frame rate of said playback of said media stream.
    30. The server (600) according to claim 28, wherein said means for providing said pre-defined value to said client are means for providing said pre-defined value to said client during QoE negotiation.
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    US8010652B2 (en) 2011-08-30
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    KR20060135939A (en) 2006-12-29
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    AU2005241687A1 (en) 2005-11-17
    KR100813929B1 (en) 2008-03-18
    TW200623774A (en) 2006-07-01
    CN1951083A (en) 2007-04-18
    AU2005241687B2 (en) 2008-09-04
    KR100906158B1 (en) 2009-07-03
    US20050259947A1 (en) 2005-11-24
    CN1951083B (en) 2012-07-11
    JP2007536859A (en) 2007-12-13
    US20080189412A1 (en) 2008-08-07
    KR20070112433A (en) 2007-11-23

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